JPH07112473A - Molding condition setting method of injection molding machine - Google Patents

Abstract

PURPOSE:To easily and certainly set molding conditions by inputting known data to a controller in such a case that mold data is unclear to automatically set the molding conditions and setting injection pressure and a specific item according to a preset condition and altering injection pressure according to the result after molding to determine an injection speed to perform molding. CONSTITUTION:The known data of a molding material to be used is inputted to a controller. The controller sets fundamental molding conditions such a temp. conditions or the like on the basis of a preliminarily inputted data base and subsequently sets an injection speed to one speed value on a high speed side and the injection start position of a screw to the most retreat position to pressure value on a low pressure side. Next, from the result after molding, injection pressure is increased to proper magnitude and, when a good product is obtained, an injection stroke is calculated and a set cushion stroke is added thereto to calculate a weighing value and an average injection speed is calculated from the injection stroke and these calculated values are set to the controller. After molding, the injection speed or injection pressure is finely adjusted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding method for an injection molding machine, which is suitable when a mold whose mold data is unknown is used.

[0002]

2. Description of the Related Art In general, there are cases where mold data is known or unknown for a mold used in an injection molding machine. For example, when manufacturing a product, if the company has all the manufacturing processes including the mold design, the mold data such as the cavity capacity can be known from the mold drawing, model, and the like. However, in a manufacturing company or the like having only a manufacturing department, when a molding commission is received, only the mold may be delivered, and in this case, the mold data is often unknown.

By the way, when molding conditions such as measured values are set, if mold data such as cavity volume is known, it is possible to set some temporary injection conditions as initial conditions and perform molding. However, setting the molding conditions is not easy if the mold data is unknown. Therefore, conventionally,
A skilled operator visually inspects the mold cavity, sets initial conditions such as injection speed and injection pressure based on intuition and experience, and at the beginning, sets a small measured value to perform molding By gradually increasing the measured value while checking the filling state of the molded product, by repeating the molding,
The molding conditions were set by trial and error.

[0004]

However, the above-mentioned conventional methods have the following problems because they have to rely on the intuition and experience of a skilled operator.

First, since the operator performing the setting work requires a considerable degree of skill, the operators who can perform the setting are limited. Further, even a skilled operator cannot easily perform the setting work, which causes a long setting time, a decrease in productivity and an increase in manufacturing cost, and wasteful consumption of resources and energy.

Secondly, if the measured value or the injection pressure is excessively set due to a setting error or an inaccurate setting, abnormal pressure may be applied to the inside of the mold, and the mold may be damaged. , Inferior in safety.

The present invention solves the problems existing in the prior art as described above, and even an operator with low skill can easily set the molding conditions of an injection molding machine loaded with a mold whose mold data is unknown. In addition, since it can be set reliably, the setting time of the injection molding machine can be greatly shortened, productivity can be improved, manufacturing cost can be reduced, resources and energy can be saved, and damage to the mold can be prevented and safety can be improved. The purpose is to provide a method.

[0008]

According to the present invention, when setting molding conditions of an injection molding machine 1 using a mold 2 whose mold data is unknown, at least known data is input to the controller 3 in advance. The first setting step A for setting the molding conditions based on the prepared database and the known data, and the molding under the predetermined constant molding conditions for the injection pressure P, the injection speed V and the injection start position of the screw 4. In addition, the injection pressure P based on the molded product
By changing the injection pressure P, the injection speed V and the measured value Md, and the second setting step B, and the molding conditions obtained from the second setting step B.
It is characterized by comprising a third setting step C for adjusting the molding conditions based on the molded product.

In this case, in the first setting step A, the molding conditions relating to temperature are set by inputting at least the data relating to the type of molding material to the controller 3 as known data. In the second setting step B, the injection pressure P is set to one pressure value Pd on the low pressure side, the injection speed V is set to one speed value Vh on the high pressure side, and the injection start position of the screw 4 is set to the last retracted position as constant molding conditions. Each of them is set to Xb, and the magnitude of the injection pressure P is changed by a preset change amount according to the degree of defective filling of a molded product molded under constant molding conditions, and remolding is performed by the changed injection pressure. The re-molding cycle is repeated until a good product is obtained, and when the good product is obtained, the magnitude of the injection pressure P, the magnitude of the injection speed V and the measured value M
The molding conditions can be set based on d. Furthermore, the third setting step C includes an adjusting step of adjusting the injection speed V or the injection pressure P in the injection step to a multistage multispeed or multistage multipressure.

[0010]

According to the molding condition setting method of the present invention, the injection molding machine 1 basically uses the mold 2 whose mold data is unknown.
The molding conditions can be set semi-automatically so that even a less skilled operator can easily and surely set the molding conditions.

Therefore, in the present invention, the step of setting the molding conditions is divided into a plurality of setting steps, and the stepwise setting work is performed. First, in the first setting step A, known data is input to the controller 3 to set a database prepared in advance and molding conditions based on the known data. In this case, the required molding conditions are automatically set only by inputting known data. For example, if data relating to the type of molding material is input to the controller 3 as known data, molding conditions relating to temperature (heating cylinder temperature, mold temperature, etc.) are calculated based on the properties and characteristics of the molding material prepared in advance as a database. Is set. Upon completion of the first setting process A, the injection molding machine 1 can operate basically.

Next, in the second setting step B, with respect to the injection pressure, the injection speed and the injection start position of the screw 4,
A constant molding condition is set in advance, that is, the injection pressure is set to one pressure value Pd on the low pressure side, the injection speed is set to one speed value Vh on the high pressure side, and the injection start position of the screw 4 is set to the rearmost retreat position Xb. The molding is performed under constant molding conditions, and the injection pressure is changed based on the molded product to set the molding conditions regarding the injection pressure, the injection speed, and the measured value. In this case, according to the degree of defective filling of the molded product, the size of the injection pressure is changed by a preset change amount, and the remolding cycle is performed with the changed injection pressure until a good product is obtained. The molding conditions can be repeatedly set based on the magnitude of the injection pressure P, the magnitude of the injection speed V, and the measured value Md when a non-defective product is obtained. Therefore, if the operator can judge the degree of defective filling of the molded product, the setting of the molding condition is performed semi-automatically. By the end of the second setting step B, it is possible to obtain a good-quality molded product to some extent from the injection molding machine 1.

Next, in the third setting step C, molding is performed under the molding conditions obtained from the second setting step B, and
Adjustments are made to the molding conditions based on the molded product. In this case, the setting of the molding conditions is semi-automatic if the operator can judge the occurrence position and the degree of the filling failure in the molded product, including the adjustment process of adjusting the injection speed or the injection pressure in the injection process to the multistage multispeed or the multistage multipressure. Done. In the third setting step C, the molding conditions are adjusted so that the best product can be obtained, and the final decision is made regarding the quality.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, preferred embodiments according to the present invention will be described in detail with reference to the drawings.

First, a schematic structure of an injection molding machine 1 capable of carrying out the molding condition setting method according to the present invention will be described with reference to FIG.

The injection molding machine 1 has a machine base 5, and the machine base 5
Of the mold 2 which has an injection device 6 on one side of the upper surface and is covered with a safety cover 7 on the other side of the upper surface of which the mold data is unknown.
Equipped with. In this case, the mold 2 is supported by a mold clamping device not shown in the figure, and the injection device 6 is moved forward and backward by the moving device 8.
Move forward and backward by. The injection device 6 has an injection nozzle 1 at the tip.
0 is provided with a heating cylinder 9 having a hopper 11 at the rear thereof, and the heating cylinder 9 has the screw 4 built therein (see FIG. 3). On the other hand, at the rear end of the heating cylinder 9, a screw drive device 12 that rotates and moves the screw 4 forward and backward is provided. As the screw drive device 12, an electric drive type using a servo motor and a hydraulic drive type using a hydraulic circuit are known.

On the other hand, in FIG. 2, 3 is built in the machine base 5,
It is also a controller that controls the entire injection molding machine 1. An input device (keyboard) 13 is attached to the side panel 5p of the machine base 5, and is connected to the controller 3. The input device 13 and the controller 3 have a setting function for setting various conditions. Furthermore, 14 is a screw position detector, for example, in the case of an electric drive type, a rotary encoder that detects the rotation speed of the servo motor, and in the case of a hydraulic drive type, a linear scale that directly detects the screw position is used. it can. The screw position detector 14 is directly connected to the controller 3, and is also connected to the controller 3 via the speed converter 15. The speed converter 15 has a function of differentiating the position signal from the screw position detector 14 and converting it into a speed signal of the screw.

On the other hand, 16 is an injection pressure detector, for example, a load cell for detecting the back pressure at the rear end of the screw 3 in the case of an electrically driven type, and a hydraulic pressure of a hydraulic cylinder in the case of a hydraulic driven type. A hydraulic sensor or the like can be used. 1
Reference numeral 7 denotes a display attached to the side panel 5p, which performs various displays and is used as an auxiliary device of the input device 13. Further, the controller 3 is connected to the system computer 18 by an optical communication system (wireless system) or the like.

Next, a molding condition setting method according to the present invention will be described with reference to FIGS.

FIG. 1 is an overall flowchart showing a procedure for setting molding conditions according to the present invention. First, prior to setting, the selection key Ks on the input device 13 is pressed to select the molding condition automatic setting mode (step 2).
1). Then, the molding conditions are set based on the first setting step A. First, the input device 13 and the display 1
The known data regarding the molding material, the specification screw and the like are input by using 7 (step 22). The controller 3 stores a database regarding material characteristics, molding machine performance specifications, basic molding conditions, etc. The controller 3 uses the input known data and the stored database to form basic conditions such as temperature-related molding conditions and maximum screw stroke. Specific molding conditions are obtained and set in the controller 3 (step 23). The molding conditions relating to temperature, that is, the heating cylinder temperature and the mold temperature are automatically set based on the type of molding material.

Upon completion of the first setting step A, molding conditions are set based on the second setting step B (step 2).
4).

Next, the setting procedure in the second setting step B will be described with reference to FIGS. First, initial conditions are set (step 31). Initial conditions are set according to the flowchart shown in FIG.

First, as an injection condition, the injection speed is set to the first speed value Vh on the high speed side (step 51). in this case,
The first speed value Vh on the high speed side is higher than the midpoint of the setting range of the injection molding machine used, and it is desirable to select a value of 90% or more with respect to the maximum speed. Further, the injection start position of the screw 3 is set to the last retracted position Xb (step 52). In this case, the last retracted position Xb does not mean a complete rear end, but is a concept including an arbitrary rear position capable of measuring a sufficient amount of resin with respect to the volume of the mold 2. Furthermore, the injection pressure is set to one pressure value Pd on the low pressure side (step 53). In this case, the one pressure value Pd on the low pressure side is the low pressure side from the midpoint of the set range in the injection molding machine used, and is preferably selected to be 30% or less of the maximum pressure. In addition to the above settings, various molding conditions such as holding pressure switching position, back pressure, cooling time, and screw rotation speed are set in the initial condition setting (step 54).

Further, a set speed Vs and a set time Ts for detecting the injection end position Xf of the screw 4 are set.
The set speed Vs is a threshold value with respect to the injection speed V for detecting the end of filling the resin into the mold 2, and can be set to about several m / sec which is almost in the stopped state. The set time Ts is a time for ensuring more reliable filling after the speed becomes equal to or lower than the set speed Vs, and can be set to, for example, about several seconds.

Next, the back pressure is turned off (zero), and measurement is performed without back pressure (step 32). At this time, the screw 4 is shown in FIG.
As shown in (a), it retreats to the last retreat position Xb. Then, by selecting the semi-automatic molding mode, the injection device 6 (injection nozzle 10) advances (steps 33, 3).
4). On the other hand, injection is started by touching the nozzle. That is, the screw 4 advances according to the set initial conditions, and the resin L is injected and filled in the mold 2 (step 35). At this time, the controller 3 monitors the injection speed V at the time of filling obtained from the speed converter 15. As shown in FIG. 1, the injection speed V is the set speed Vs if the mold L is being filled with the resin L.
When the filling with the resin L is completed, it becomes much lower than the set speed Vs and becomes lower than the set speed Vs. Therefore, the injection speed V is monitored, and the set time Ts is measured when the injection speed V becomes equal to or lower than the set speed Vs (step 3).
6, 37). When the set time Ts has elapsed, the injection end position Xf shown in FIG. 3B is monitored (steps 38 and 39).

In this case, the injection pressure P obtained from the injection pressure detector 16 may be monitored by setting the set pressure Ps as the threshold value. That is, since the injection pressure P is much smaller than the set pressure Ps while the resin L is being filled in the mold 2, the injection pressure P rapidly rises to the set pressure Ps or more after the filling of the resin L is completed. Therefore, the injection pressure P
The injection end position Xf can be detected in the same manner as above based on the fact that the pressure reaches the set pressure Ps.

Next, a process for changing the injection pressure is performed (step 40). This change process mainly increases the injection pressure (one pressure value) set to the low pressure side to an appropriate level, and the change process procedure is shown in a flowchart in FIG. 7.

At this time, first, the back pressure is turned on, the weighing is performed with the back pressure applied, and the injection device 6 (the injection nozzle 10) is retracted to open the mold 2 (step 61, 62, 63). Then, the defective filling of the molded product taken out is judged, and necessary data collection, for example, data collection of wall thickness, gate pressure, etc. is carried out (step 64). At this time, the cooling time is automatically calculated from the collected data on the wall thickness and the gate pressure.

By the way, the input device 13 is provided with selection keys Kx, Ky, Kz (see FIG. 2) capable of selecting the kind of filling failure and the rank for the degree of each filling failure, and the controller 3 has no filling failure. A plurality of change amounts corresponding to respective ranks for changing the injection pressure in the direction to be set are set.

For example, when the defective filling is a short shot, as shown in FIG. 8, the degree of the short shot is classified into three levels of "large", "medium", and "small".
When "Large", the pressure change rate (change amount) is "+ 20%",
When "medium", the pressure change rate is set to "+ 10%", and when "small", the pressure change rate is set to "+ 5%". In this case, the ranks are “large”, “medium”, and “small”, but of course they may be digitized. It should be noted that the pressure change rate is used as the change amount because the injection pressure is usually set as a ratio to the maximum pressure. Therefore, for example, if "Large" is selected as the degree of short shot, the pressure change rate "+
20% "is selected, and 20% is added to the set injection pressure ratio. As described above, the change amount may be set as an absolute amount or a ratio, or may be changed by addition / subtraction or multiplication / division with respect to the injection pressure.

Similarly, in the case of overfilling, as shown in FIG. 9, the degree of overfilling is divided into three levels of "small", "medium", and "large", and "small" is designated. When the pressure change rate is "-2%", when "medium" the pressure change rate is "-5%",
When the value is "large", the pressure change rate is set to "-10%". As described above, in any case, the pressure change rate is set to be large corresponding to the rank having a large degree of filling failure.

Therefore, the molded product is visually inspected, and if a short shot occurs due to insufficient filling, a process of increasing the injection pressure is performed (steps 65 and 66). That is,
The degree of the short shot is judged. For example, if the degree is “large”, the corresponding selection key Kx in the input device 13 may be pressed. In this case, since the injection pressure is set to one pressure value Pd on the low pressure side as an initial condition, if the one pressure value Pd is set to 20%, the controller 3 changes the pressure change rate with respect to the injection pressure 20%. The injection pressure P is changed to 40% by adding 20% of Then, remolding is performed by the changed (increased) injection pressure, that is, steps 34 to 40 shown in FIG. 5 and steps 61 to 6 shown in FIG.
The remolding cycle, which is the process of step 4, is executed (step 6).
7). Then, if a short shot is further generated in the molded product, the process of increasing the injection pressure is performed again. For example, the degree of short shot is "Medium"
If so, similarly, 10% of the pressure change rate is added to the injection pressure, and the remolding cycle is executed. The size of each pressure change rate is different, and it is set large corresponding to the rank with a large degree of filling failure. Therefore, if you repeat the remolding cycle after changing the injection pressure in this way, you can select the rank. Gradually becomes smaller, and finally a good product can be obtained (Step 6
8).

On the other hand, when the formed molded product is visually inspected and filling failure such as burrs due to overfilling occurs, the injection pressure is reduced (steps 69 and 70). In this case, the degree of overfilling is judged and, for example, the degree is “small”.
If so, by pressing the select key on the input device 13, the controller 3 subtracts 2% of the pressure change rate from the magnitude of the set injection pressure. Then, the remolding by the changed (decreased) injection pressure, that is, the remolding cycle is repeated until a good product is obtained (steps 71 and 7).
2).

Therefore, if a non-defective product is finally obtained, the controller 3 takes in the injection end position Xf at that time obtained from the screw position detector 14, and obtains the obtained injection end position X.
From f and the last retreat position Xb, the injection stroke Si (= Xb
-Xf) is calculated and a preset cushion stroke Sc is added to obtain the measured value Md. And
The measured value Md is set in the controller 3 as a molding condition (step 41).

Further, the molding conditions are finally obtained by utilizing the injection pressure and the injection speed when the non-defective product is finally obtained, and the obtained molding conditions are set in the controller 3 (step 41). In this case, the average injection speed at the injection stroke Si when a good product is obtained is obtained. The injection speed V depends on the initial conditions.
Although it is set to the first speed value Vh on the high speed side, the injection speed V in actual molding is much smaller than this, so an average injection speed is obtained and this injection speed is set in the controller 3 as molding conditions. To do. In this case, the averaged injection speed may be obtained by dividing the injection speed V ...
Alternatively, the area of the speed characteristic with respect to the position of the screw 4 may be obtained, and this area may be divided by the position and averaged.

On the other hand, the injection pressure is set by adding the correction pressure. The injection speed depends on the initial conditions, and the first speed value Vh on the high speed side
The average injection speed is smaller than the first speed value Vh of the initial condition because the average injection speed is set after averaging as described above. Therefore, in order to stabilize the reduced injection speed, a constant override pressure is added to the injection pressure as a correction pressure in consideration of the fluctuating pressure based on the override characteristic of a proportional pump or the like. In the case of a proportional pump used for hydraulic drive,
Values around 10% can be added. From the above,
The molding condition setting process based on the second setting step B is completed.

Next, the molding conditions are set based on the third setting step C (step 25). In the third setting step C, molding is performed under the molding conditions obtained from the second setting step B, and the molding conditions are adjusted based on the molded product. The adjustment in this case is basically performed by the same principle as the above-mentioned injection pressure changing process. In the case of change processing, the difference is that the one-pressure value or the one-speed value is set as it is, so it is difficult to completely eliminate the defects that partially occur in the molded product, and the relatively best condition is a good product. However, the adjustment process according to the present invention is performed by focusing on the filling process in the injection process with respect to the changed injection speed of the first speed value or the injection pressure of the one pressure value. In order to obtain the best product, the molding conditions (injection speed or injection pressure) are finely adjusted. Therefore, specifically, the injection speed is multistage, multispeed,
The injection pressure is adjusted to multistage multipressure.

First, FIG. 10 shows a part of a keyboard provided in the input device 13, K1, K2, K3 ... Are a plurality of selection keys for selecting the type of defective filling of the molded product, and K7, K8. , K9 are selection keys for selecting a filling process in which a filling failure occurs in the injection process. In the embodiment, as the filling failure, the selection key K1 is "burr", the selection key K2 is "short shot", and the selection key K3 is. "Sink", select key K4 "Shetting", select key K
5 is set to "crack" and the selection key K6 is set to "flow mark". As a filling process, the selection key K7 is set to "runner", the selection key K8 is set to "filling", and the selection key K is set.
"End of filling period" was set to 9. B0 is a selection key when no defective filling occurs.

Further, by using the input device 13 and the controller 3 in advance, a rank for the degree of poor filling and a plurality of change amounts corresponding to each rank are set for each type of poor filling, and the degree of defective filling is set. The size of each change amount is set to be different so that the change amount increases in accordance with the rank of. In this case, for example, when the defective filling is burr, the degree of burr is classified into “large”, “medium”, and “small”. In the embodiment, as shown in FIG. 10, the selection key Ka is "large", the selection key Kb is "medium", and the selection key Kc.
Was set to "small". Then, as shown in FIG.
When "Large", the speed change rate (change amount) is "-10%",
When "medium", the speed change rate is set to "-5%", and when "small", the speed change rate is set to "-2%". In addition,
The ranks are “large”, “medium”, and “small”, but of course they may be digitized. Also, the speed change rate was used as the change amount,
The reason is that the injection speed is usually set as a ratio of the maximum speed. Therefore, for example, if "Large" is selected, 10% is subtracted from the value of the injection speed. As described above, the change amount may be set as an absolute amount or a ratio, or may be set by addition / subtraction or multiplication / division with respect to the injection speed.

The controller 12 has a function of changing the molding condition of the selected filling process according to the change amount corresponding to the type and rank of the selected filling failure.

The adjustment procedure will be described in detail below.
First, if molding is performed under the molding conditions obtained in the second setting step B, the first molded article can be obtained, and thus the obtained molded article is visually observed. At this time, for example, when a burr due to overfilling has occurred in a part of the molded product, the operator determines that the burr position is due to "end of filling", and the rank of the degree is " If it is determined to be “large”, the corresponding selection key K1, selection key K9 and selection key Ka on the input device 13 may be pressed. As a result, the controller 12 selects the speed change rate “−10%” shown in FIG. 12, which is the change amount corresponding to the selected rank “Large”, and selects the corresponding injection speed in the filling process at the “final filling stage”. 10% is subtracted from the size. That is, as shown in FIG. 11A, assuming that the injection speed V of the first speed value after the change processing is set to 50% of the maximum speed, for example, FIG. As shown in, the injection speed Va corresponding to the filling process at the “final filling stage” is changed to 40%.

Then, re-molding is performed at the reduced injection speed Va, and if burrs are further generated in the molded product, the injection speed is again reduced. That is, at this time, if the rank of the degree of burr is lowered to "medium", the corresponding selection key Kb in the input device 13 is pressed. Thereby, in the controller 12, the change amount corresponding to the selected rank "medium", that is,
The speed change rate “−5%” is selected, and as shown in FIG. 11C, the injection speed Vb is set by subtracting 5% from the injection speed Va. Therefore, for the filling process at the "final filling stage", such a re-molding cycle in which the injection speed is changed and re-molding is repeated until burrs are completely eliminated. In this case, the size of each change amount is different and is set large corresponding to the rank with a large degree of filling failure, so the rank to be selected gradually becomes smaller as the remolding cycle is repeated, and finally It is possible to completely eliminate burrs at the "end of filling". .

As shown in FIG. 10, it is desirable to display the injection speed characteristic with respect to the screw position on the display 17, and particularly display the characteristic Ea before adjustment and the characteristic Eb after adjustment in an overlapping manner. As a result, the adjustment can be more easily and accurately performed, and the auxiliary use is possible.

When the above setting process is completed,
Adjustments such as shortening of the molding cycle are made, and the obtained molding conditions are finally set (step 26).

The embodiment has been described in detail above.
The present invention is not limited to such an embodiment.
For example, although the molding condition for adjusting has exemplified the injection speed,
The same applies to the injection pressure. In addition, the detailed configuration, method, and the like can be arbitrarily changed without departing from the scope of the present invention.

[0046]

As described above, according to the present invention, at the time of setting the molding conditions of the injection molding machine using the mold whose mold data is unknown, at least the known data is input to the controller to prepare the database prepared in advance. And the first setting step to set the molding conditions based on known data, and the injection pressure, injection speed, and injection start position of the screw, the molding is performed under the preset constant molding conditions, and based on the molded product To change the injection pressure,
The second setting step of setting the molding conditions relating to the injection speed and the measured value and the molding condition obtained from the second setting step are performed, and the molding condition is adjusted based on the molded product. Since the setting process is provided, the following remarkable effects are achieved.

Even an operator with low skill level
The molding conditions of an injection molding machine loaded with a mold whose mold data is unknown can be set very easily and reliably, and it is possible to shorten the setting time, improve productivity, reduce manufacturing cost, and save resources and energy. .

Since setting mistakes and improper settings are eliminated, it is possible to prevent damage to the mold and improve safety.

[Brief description of drawings]

FIG. 1 is a flowchart showing a setting procedure by a molding condition setting method according to the present invention,

FIG. 2 is a configuration diagram of an injection molding machine that can perform the molding condition setting method,

FIG. 3 is a schematic cross-sectional view of a heating cylinder showing a screw position when a second setting process is performed by the molding condition setting method,

FIG. 4 is a characteristic diagram for explaining a setting method in a second setting step according to the molding condition setting method,

FIG. 5 is a flowchart showing a setting procedure in a second setting step according to the molding condition setting method,

FIG. 6 is a flowchart showing a procedure for setting initial conditions in a second setting step according to the molding condition setting method,

FIG. 7 is a flowchart showing an injection pressure changing process procedure in a second setting step according to the molding condition setting method;

FIG. 8 is a principle explanatory view for explaining a method of changing an injection pressure in a second setting step according to the molding condition setting method,

FIG. 9 is another principle explanatory diagram for explaining a method of changing the injection pressure in the second setting step by the molding condition setting method.

FIG. 10 is a pattern diagram of a keyboard of an input device used in a third setting step according to the molding condition setting method,

FIG. 11 is a molding condition setting characteristic diagram of an injection speed for explaining a third setting step according to the same molding condition setting method;

FIG. 12 is a principle explanatory view for explaining a method of changing an injection speed in a third setting step according to the molding condition setting method;

[Explanation of symbols]

 1 Injection Molding Machine 2 Mold 3 Controller 4 Screw A First Setting Step B Second Setting Step C Third Setting Step

Front page continuation (72) Minor Yamazaki, Minamijo 2110, Nanjo, Osaka Castle, Hanashina-gun, Nagano Prefecture, Nissei Plastic Industry Co., Ltd. In-house (72) Inventor Toshimi Kato 2110 Nanjo, Oosaka, Sakagi-cho, Hanashina-gun, Nagano Nissei Plastic Industry Co., Ltd.

Claims (5)

[Claims] 1. An injection molding machine characterized by including at least the following setting steps (a) to (c) when setting molding conditions of an injection molding machine using a mold whose mold data is unknown. Molding condition setting method. (A) A first setting step of setting a molding condition based on the previously prepared database and the known data by inputting the known data to the controller, (b) the injection pressure, the injection speed and the injection start position of the screw. Then, the molding is performed under preset constant molding conditions, and the injection pressure is changed based on the molded product.
A second setting step of setting the molding conditions relating to the injection speed and the measured value, (c) molding according to the molding conditions obtained from the second setting step, and adjusting the molding conditions based on the molded article. Three setting process, 2. The injection molding machine according to claim 1, wherein in the first setting step, molding conditions relating to temperature are set by inputting at least data relating to the type of molding material to the controller as known data. Molding condition setting method. 3. The second setting step is a constant molding condition,
The molding of the injection molding machine according to claim 1, wherein the injection pressure is set to a low pressure side one pressure value, the injection speed is set to a high pressure side one speed value, and the injection start position of the screw is set to the most retracted position. Condition setting method. 4. The second setting step changes the magnitude of the injection pressure by a preset change amount in accordance with the degree of defective filling of a molded product molded under constant molding conditions, and The remolding cycle to remold,
The injection molding machine according to claim 1 or 3, wherein the molding condition is set on the basis of the magnitude of the injection pressure, the magnitude of the injection speed and the measured value when the non-defective product is obtained. Molding condition setting method. 5. The molding condition of the injection molding machine according to claim 1, wherein the third setting step includes an adjusting step of adjusting an injection speed or an injection pressure in the injection step to a multistage multispeed or multistage multipressure. Setting method.